Chief Executive Officer, Ben Kealy met Day, who expressed gratitude to Digicel Tonga for supporting the event for the second consecutive year.
Day said she hopes to do her best at the event as well as inspire Tongan girls and young women to participate in swimming.
Kealy said the aim is to develop swimming and encourage youth to represent Tonga.
The Apolima Strait Crossing, a 22.3km open water swim from Upolu Island to Savaii is scheduled to be held on 6 April, 2018.
Last year the Tongan team of four young swimmers including Day came first in the team relay.